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<H1>pamsharpness</H1>
Updated: 07 February 2004
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<A HREF="#index">Table Of Contents</A>
<H2>NAME</H2>
pamsharpness - measure the sharpness of a PNM/PAM image
<H2 id="synopsis">SYNOPSIS</H2>
<B>pamsharpness</B> [<I>imagefile</I>]
<H2 id="description">DESCRIPTION</H2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>pamsharpness</b> reads a Netpbm image (PNM or PAM) and prints a
message to Standard Output giving a number that tells how sharp it is.
<p>Sharpness is a measure of how suddenly (in space) colors change in
the image. <b>pamsharpness</b> computes the sharpness of the image as
the average difference in intensity between each pixel and its 8 surrounding
pixels, in each of the color components (R, G, B).
<p><b>pamsharpness</b> does not include the edges of the image, where
there are not 8 pixels surrounding a pixel, in its computation.
<p><b>pamsharpness</b> assumes that the image is a PNM or PNM
equivalent PAM. If it isn't, the results are not necessarily
meaningful.
<H2 id="seealso">SEE ALSO</H2>
<B><A HREF="pamsharpmap.html">pamsharpmap</A></B>,
<B><A HREF="pammasksharpen.html">pammasksharpen</A></B>,
<B><A HREF="pam.html">pam</A></B>,
<B><A HREF="pnm.html">pnm</A></B>
<h2 id="history">HISTORY</h2>
<p><b>pamsharpness</b> was added to Netpbm in Release 10.21 (March
2004). Bryan Henderson derived it from the program <b>pnmsharp</b> by
B.W. van Schooten and distributed as part of the Photopnmtools
package.
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<H2 id="index">Table Of Contents</H2>
<UL>
<LI><A HREF="#synopsis">SYNOPSIS</A>
<LI><A HREF="#description">DESCRIPTION</A>
<LI><A HREF="#seealso">SEE ALSO</A>
<LI><A HREF="#history">HISTORY</A>
</UL>
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